bulma/docs/_includes/elements/sponsor-item.html

{% assign sponsor = site.data.sponsors.by_id[include.sponsor_id] %}
{% assign sponsor_path = "sponsors/" | append: include.sponsor_id %}
{% assign sponsor_alt = sponsor.name | append: " logo" %}

<div class="{{ include.classname }}">
  <a
    href="{{ sponsor.url }}"
    target="_blank"
    {% unless sponsor.follow %}
    rel="nofollow"
    {% endunless %}
    {% if sponsor.blend %}style="mix-blend-mode: multiply;"{% endif %}
    >
    {%
      include elements/responsive-image.html
      path=sponsor_path
      extension="png"
      alt=sponsor_alt
      width=sponsor.width
      height=sponsor.width
    %}
  </a>
</div>